In a laboratory where the air is 22oC, a steel cylinder at 100. oC is submerged in water at 40. oC. In this system, heat flow from (1) both the air and the water to the cylinder
(2) both the cylinder and the air to the water
(3) the air to the water and from the water to the cylinder
(4) the cylinder to the water and from the water to the air
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